Raises the Save DC by 1, raises the damage dealt by +1/die, raises the Caster level by 1 for purposes of overcoming SR, and gives a +1 bonus on attack rolls if the spell requires a touch attack (ranged or melee) for all spells with the fire descriptor.

The robe itself is fashioned from Efreeti skin and dragon scales that requires a DC 30 Craft (armor) or Craft (leather working) check and takes at least 1 month. Alone it provides a +4 armor bonus and provides resistance to fire 10, and counts as light armor. When enchanting the robe, you must draw a runic circle around the robe with the soil and set it ablaze with alchemists fire. Then the spells can be cast.

There are several material components that must be used in order to create the robes as well as the spells involved.